Auditory processing disorder (also known as central auditory processing disorder or CAPD) is a condition that makes it hard for kids to recognize subtle differences between sounds in words. It affects their ability to process what other people are saying.
Gallium is a solid metal at room temperature, but it melts in your hands. 00:09. When gallium is in its liquid state, if feels like cold melted solder in your hands. 00:33. Melting gallium onto aluminum makes the aluminum brittle enough to break with your fingers.
The lump of metal can be cold (by metal standards, 1/3 of its melting point) or hot (near the melting point, about the only option if you want to forge iron). Other common processes are casting (pouring liquid metal into a mold) and CNC (Computer Numeric Control) machining. The strongest result is usually from forging.